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| Study of the friction lubrication characteristics of sliding rough interface in line contact |
| XIAO Huifang1, Yang Quan1, SHAO Yimin2 |
1. National Engineering Research Center of Flat Rolling Equipment, University of Science and Technology Beijing, Beijing 100083;
2. State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044 |
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Abstract The dynamic friction lubriction characteristics in sliding rough interface are important to lubrication design and lubriation state prediction of mechanical structures. In this paper, the sliding rough interface model describing different lubrication states is established based on the load sharing concept that the total normal load is shared by the hydrodynamic lifting force and the asperity interacting force. The rough surface topography is described using the Greenwood-Williamson statistic model. The film thickness equation and the asperity contact pressure equation at the lubricating interface are established considering the time varient effect and the viscosity-pressure characteristic. The relationship between hydrodynamic scaling factor, film thickness, friction coefficient and sliding velocity are obtained in the full lubrication regimes of boundary lubrication, mixed lubrication and elastohydrodynamic lubrication. Expression of the critical velocity, at which the transition from mixed lubrication to elastohydrodynamic lubrication occurs is derived. The lubrication loading mechanism is analyzed and the evolution of film thickness, friction coefficient and critical velocity with respect to surface roughness, normal load and lubrication viscosity are obtained. The obtained results provide theoretical and experimental guidelines to lubration design, prediction and optimization.
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Received: 22 September 2014
Published: 25 December 2015
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